Calculate coefficient of rank correlation between the marks in economics and statistics as indicated by 7 answer book of each subject.
X | 20 | 11 | 72 | 65 | 43 | 29 | 50 |
Y | 60 | 63 | 26 | 35 | 43 | 51 | 37 |
X | Y | R1 | R2 | D = (R1 – R2) | D2 |
20 | 60 | 2 | 6 | –4 | 16 |
11 | 63 | 1 | 7 | –6 | 36 |
72 | 26 | 7 | 1 | 6 | 36 |
65 | 35 | 6 | 2 | 4 | 16 |
43 | 43 | 4 | 4 | 0 | 0 |
29 | 51 | 3 | 5 | –2 | 4 |
50 | 37 | 5 | 3 | 2 | 4 |
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| ΣD2 = 112 |
Thus, Spearman's rank correlation coefficient is (- 1).